Twenty-four US navigational satellites circle the globe, forming the Global Positioning System (GPS).
With a radio receiver, it is possible to locate your geographic position to within a few meters anywhere on earth. So accurate and dependable is this system that it has become indispensable for surveying and mapping, logistical supply chains, and transportation safety. For the wilderness adventurer, it has proven a lifesaver many times over. Handheld GPS receivers are designed to be rugged, able to survive and function in severe conditions, and available at outdoor recreation and marine stores for around $100.
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